Noise and distortion on sound

Around the 15 minute and 50 minute time the system starts making a popping noise and then distorts the sound when watching Sky and or Video and or Tv but not dvds direct thru the TV. It has been suggested that there is some sort of feedback via the cable or scart setup, but I am at a loss of how to sort this out. Martin Moss.

When the unit has been left on, or when playing copied music CD's there is a distortion in the sound it becomes muffled, crackling and popping, can anyone help me?When the unit has been left on, or when playing copied music CD's there is a distortion in the sound it becomes muffled, crackling and popping, can anyone help me?

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Your speakers may say 350 watts but that is the peak wattage at which they blow up and not a wattage they can sound distortion free at. Look for the RMS wattage which is probably around 40 watts. If you look at the specs on your receiver you will see it will put out a maximum of about 50 watts but the distortion on the receiver is above 1 percent at anything over 22 watts. That means they are going to start distorting at around half volume. The other thing you might check for is a impedance mismatch between the speakers and the receiver. Is the receiver set up for an impedence output of 8 ohms but your speakers are 4 ohms impedance.

This is a case of one or more transistors breaking down when heated. This can be found usually by using freeze spray to cool down one transistor at a time until the problem clears up. You can narrow this down a bit by determining whether this "noise" is effecgted by the volume control or not. Also, does the problem show up faster when the unit plays louder?

Usually Noise comes from distortion such as Electricity (50-60Hz), Main reason audio input cables might have shielding problem. Make sure cable is connected well and shield is not destroyed. You can understand it when you unplug the input connection and use the Computer volume by playing a digital media. If distortion persists contact to TASCAM @+1-323-727-7617

Sounds like the capacitor that goes bad just before the hIgh Voltage transformer goues bad. If i were you I would call an authorized RCA repair Shope and see if this is going to cause more damage to your set in the future.